The Cisco WIC-1DSU-T1-V2 interface management features include the following:

•You can remotely configure the interface using Telnet and the Cisco IOS command line interface (CLI).

•For monitoring purposes, the router and DSU/CSU are manageable as a single Simple Network Management Protocol (SNMP) entity, using CiscoWorks or CiscoView. DSU/CSU statistics are accessed from the CLI.

•Loopbacks (including a manual button for a network line loopback) are provided for troubleshooting.

•Transmission attenuation can be tailored to cable length using the CLI.

•Test patterns, alarm counters, and performance reports are accessible using the CLI.

•The module has carrier detect, loopback, and alarm LEDs.

Benefits

This T1 DSU/CSU card works on the Cisco 1700, 2600, and 3600 series platforms, and allows customers to integrate more peripheral network components into the chassis. This is especially valuable to customers who deploy large scale, end-to-end Cisco-based branch networks.

Other benefits of this solution include the following:

•Fewer devices to deploy and manage

•Simplified management of the router

•DSU/CSU as a single entity

•Remote/local configuration, monitoring, and troubleshooting by using the CLI

Cisco IOS software is packaged in feature sets that are supported on specific platforms. To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.

To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:

http://www.cisco.com/register

Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:

Platform support for particular Cisco IOS software releases is dependent on the availability of the software images for those platforms. Software images for some platforms may be deferred, delayed, or changed without prior notice. For updated information about platform support and availability of software images for each Cisco IOS software release, refer to the online release notes or, if supported, Cisco Feature Navigator.

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

RFCs

No new or modified RFCs are supported by this feature.

Prerequisites

The following are prerequisites to enable the T1 CSU WIC:

•Leased line from your telephone company

•Configuration parameters as specified by your telephone company. For most connections, the following default settings should suffice:

–service-module t1 clock source line

–service-module t1 data-coding normal

–service-module t1 timeslots all speed 64

–service-module t1 framing esf

–service-module t1 lbo none

–service-module t1 linecode b8zs

–no service-module t1 remote-alarm-enable

–no service-module t1 fdl

Note In telephone company initiated loopback tests that use the QRSS test pattern, the WIC-1DSU-T1-V2 must be clocked from the line. Configuring the WIC-1DSU-T1-V2 and the telephone company to use the same clock source will result in errors.

Note To view the current configuration, enter the show service-module serialslot/port command. For further information about these commands and how to change them, refer to the Cisco IOS configuration guides and command references.

Optional. Sets the transmission attenuation according to the length of the cable. For example, use the keyword 110ft if the cable length is from 0 to 110 feet. Use the keyword 220ft if the cable length is from 110 to 220 feet, and so on.

Verifying Configuration of Short Cable Transmission Attenuation

To verify the configuration of short cable transmission attenuation, enter the EXEC command show running-config interfaceserial<slot/port> replacing <slot/port> with the slot and port number of the serial interface. The following sample output shows transmission attenuation for a cable length between 0 and 110 feet:

Router#show running-config interface serial0/0

Building configuration...

Current configuration : 252 bytes

!

interface Serial0/0

no ip address

load-interval 30

no keepalive

no fair-queue

service-module t1 cablelength short 110ft

service-module t1 framing sf

service-module t1 linecode ami

service-module t1 timeslots 1-24 speed 56

no cdp enable

end

Enabling Remote Loopback Testing

To enable remote loopback testing for the WIC, use the following commands beginning in global configuration mode.

Verifying Enabling of Remote Loopback Testing

To verify the loopback status of the current interface, after the far end has been put in loopback mode, enter the command show service-module serial<slot/port> replacing <slot/port> with the slot and port number of the serial interface. The output "Unit is currently in test mode: remote loopback is in progress", as shown in the following example, indicate that remote loopback testing is enabled:

Configuration Example

This section provides a configuration example for a Cis co 1751 router with a WIC-1DSU-T1-V2 card installed. It is in a short cable environment (between 330 and 440 feet here), and is set to enter loopback when a loopback code is received on the line.

Current configuration :

!

version 12.2

no parser cache

no service single-slot-reload-enable

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname 1751-uut1

!

interface Serial0/0

ip address 10.0.0.51 255.0.0.0

service-module t1 framing esf

service-module t1 linecode b8zs

service-module t1 timeslots 1-12 speed 64

service-module t1 data-coding normal

service-module t1 cablelength short 440ft

service-module t1 remote-loopback full

!

interface FastEthernet0/0

ip address 6.0.0.1 255.0.0.0

speed auto

full-duplex

!

ip classless

no ip http server

!

!

line con 0

line aux 0

line vty 0 4

login

!

end

Command Reference

This section documents new and modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.2T command reference publications.

Defaults

Command Modes

Command History

Release

Modification

12.2( 15)ZL

This command was introduced.

Usage Guidelines

This command is intended only for the Version 2 card, WIC-1-DSU-T1 V2, as part of the service-module t1 configuration options.

Use this command to configure the tx attenuation for cables whose length is shorter than 660ft. The related command, service-module t1 lbo, is used to define the line-build-out values for cablelengths longer than 660ft. At any time, only one, either the short configuration or the lbo configuration, can exist. They cannot co-exist. The configuration of one command will cause the effect of the other command to cease and only the new command will be in effect. The no form of this command will configure the attenuation to the default line-build-out gain of 0 db.

Examples

The following example sets the short cablelength to 220ft.

Router(config)#int s0/0

Router(config-if)#service-module t1 cablelength short 220ft

Related Commands

service-module t1 remote-loopback

To specify that the fractional T1/T1 DSU/CSU module enters loopback mode when it receives a loopback code on the line, use the service-module t1 remote-loopback interface configuration command. Use the no form of this command to disable remote loopbacks.

service-module t1 remote-loopback{full | payload v54}

no service-module t1 remote-loopback{full | payload v54}

Syntax Description

full

Configures the remote loopback code used to transmit or accept CSU loopback requests.

payload

Configures the loopback code used by the local CSU/DSU to generate or detect payload-loopback commands.

v54

Industry standard loopback code. Use this configuration for CSU/DSUs that may not support the Accunet loopup standards. This keyword is used only with a payload request, not a full request.

Note By entering the service-module t1 remote-loopbackfullcommand without specifying any keywords, you enable the standard loopup codes, which use a 1-in-5 pattern for loopup and a 1-in-3 pattern for loopdown. By entering the service-module t1 remote-loopback payloadv54command without specifying any keywords, you enable the v54 pseudo-random loopup codes for loopup and v54 pseudo-random loopdown codes for loopdown.

Defaults

Full and payload loopbacks with standard-loopup codes.

Command Modes

Interface configuration mode.

Command History

Release

Modification

11.2

This command was introduced.

12.2( 15)ZL

The provision for an alternate loopback code was removed.

Usage Guidelines

The no form of this command disables loopback requests. For example, the no service-module t1 remote-loopbackfull command ignores all full-bandwidth loopback transmissions and requests.

Configuring the no form of the command might not prevent telco line providers from looping your router in esf mode because fractional T1/T1 lines use facilities data link messages to initiate loopbacks.

To have the loopback remote commands on the FT1/T1 CSU/DSU module function successfully, you need to enable the service-module t1 remote-loopback command.

Examples

The following examples display two routers connected back-to-back through a fractional T1/T1 line.